How to make calls over MTS Wi-Fi: a complete guide with settings and tips

In the age of ubiquitous internet, traditional mobile communications are gradually giving way to hybrid solutions. One such innovation is Wi-Fi calling — a technology that allows voice calls to be made over a wireless network instead of a cellular one. For subscribers MTS This option has been available for several years, but many users still don't know how to use it or what benefits it provides.

Technology VoWiFi Voice over Wi-Fi (Voice over Wi-Fi) is especially useful in areas with poor mobile network coverage—for example, in basements, country houses, or densely populated areas with overloaded cell towers. Call quality is often superior to traditional calls, and smartphone battery drain is reduced. However, proper operation requires not only a compatible phone but also proper configuration on both the device and the carrier.

In this guide we will cover All current methods for activating VoWiFi on MTS in 2026, including hidden settings for older smartphone models, pricing details, and troubleshooting solutions. We'll also pay special attention to security and network optimization for stable service operation.

What are Wi-Fi calls and how do they work on MTS?

Technology VoWiFi (or Wi-Fi Calling) allows voice traffic to be transmitted over an internet connection instead of a cellular network. The operating principle is similar to VoLTE, but instead of 4G/5G, a local wireless network is used. The main difference from instant messengers (like WhatsApp or Telegram) - calls are made through a standard phone number, not through an account in the app.

On MTS the service operates according to the standard IMS (IP Multimedia Subsystem), which guarantees:

• 🔹 Smooth transition between Wi-Fi and cellular networks without connection interruption
• 🔹 Support HD voices (wideband audio codec EVS)
• 🔹 Save call history in the standard Phone app
• 🔹 Working with services MTS (voicemail, call forwarding, conference calling)

It is important to understand that VoWiFi does not replace Internet telephony (For example, Skype or Zoom). This is an extension of mobile communications, where the operator MTS remains an intermediary. All calls are charged according to your tariff plan—as standard outgoing/incoming calls.

Terms and conditions for Wi-Fi calling on MTS

Before setting up the service, please check that you meet the following key requirements:

Please note: If you use dual SIM card, then VoWiFi will only work on the line that supports it. VoLTEOn some Samsung And Huawei You will need to manually select the slot for Wi-Fi calling in the settings.

⚠️ Attention: Connection conditions may change. For example, from 2026. MTS We have lifted the restriction on corporate VoWiFi plans, but the service is still unavailable in some regions (Crimea, Sevastopol). Check the latest information in your personal account or via USSD command. *111*52#.

Step-by-step setup of VoWiFi on Android devices

Instructions for most modern smartphones on Android 9 and higher. If your model does not support the standard method, see the section about hidden settings.

Update your firmware to the latest version|Insert your MTS USIM card|Connect to a stable Wi-Fi network|Activate VoLTE in settings|Turn on Wi-Fi Calling-->

1. Open Settings → Connections → Mobile network (on Samsung) or Settings → Network & Internet → Mobile network (in "clean" Android).

2. Find the item Wi-Fi Calling (may be called Wi-Fi Calling or VoWiFi). On some Xiaomi And Realme the option is hidden in Additional settings → Calls.

3. Activate the switch. The system may request confirmation via SMS (sent automatically).

4. From the list of operators, select MTS (sometimes a device reboot is required).

5. Once activated, an icon will appear in the status bar. Wi-Fi with a pipe or an inscription VoWiFi.

If the option is not in the menu, try:

• 📱 Update firmware via Settings → Software Update
• 🔄 Restart your phone and router
• 📶 Temporarily disable VoLTE, then turn it on again
• 🔧 Reset network settings (Settings → System → Reset → Reset Mobile Network)

Yes, it worked the first time|I had to update the firmware|I had to enable hidden settings|My model doesn't support VoWiFi|I haven't tried it-->

Setting up Wi-Fi Calling on iPhone

On devices Apple The activation process is simpler, but there are some nuances with dual SIM support. The instructions are relevant for iOS 16 and newer:

1. Go to Settings → Cellular → MTS SIM card (if there are several).

2. Select Wi-Fi calling and move the slider to the position "On".

3. In the window that appears, click "Turn on" for confirmation.

4. Wait for activation (may take up to 2 minutes). The following message will appear in the status bar: MTS Wi-Fi.

For two SIM cards:

• 📱 VoWiFi will only work on the main line (the one used for iMessage And FaceTime)
• 🔄 To change the priority, go to Settings → Cellular → Primary SIM Card
• ⚠️ On iPhone With eSIM + VoWiFi may not work reliably with a physical SIM card - it is recommended to use one card

If calls do not go through after activation:

⚠️ Attention: On some iPhone With iOS 15 and below, a bug may occur where VoWiFi disconnects after a reboot. Solution: Update to the latest version. iOS or manually enable the option after each time you turn off your phone.

Hidden VoWiFi settings for unofficially supported devices

If your smartphone is not included in official list MTS, but it works on Android 10+, try activating VoWiFi through the engineering menu. This method works for many models. Xiaomi, Meizu And Nokia.

Engineering menu instructions (for advanced users only!)

1. Open the Phone app and enter the code ##4636##.

2. Go to the section Phone information (or Phone Information).

3. Scroll down to the block Wi-Fi Calling or IMS Service Status.

4. Enable options VoWiFi Provisioned And IMS over Wi-Fi (if available).

5. Save the settings and reboot the device.

⚠️ Do not change other parameters in the engineering menu - this may disrupt the network!

For devices Samsung with firmware based on One UI 2.5 and below:

1. Install the application Samsung Band Selection from Galaxy Store.
2. Open it and go to Service Mode → [1] UMTS → [1] Debug Screen → [6] Phone Control → [6] Network Control → [1] Wi-Fi Calling.
3. Enable the option and save the changes.

On Xiaomi (MIUI 12 and newer) sometimes a factory reset helps IMS:

1. Enter the code in the "Phone" app ##86583##.
2. Select Clear IMS and confirm.
3. Restart your phone and check if the VoWiFi option appears in the settings.

⚠️ Attention: Using engineering codes may cause the communication module to malfunction. If mobile network coverage is lost after these steps, perform a factory reset or contact a service center. MTS does not provide support for unofficial VoWiFi activation methods.

Troubleshooting Wi-Fi calling on MTS

Even with proper setup, users still encounter common errors. Here are the most common issues and how to resolve them:

If the problem persists:

• 📞 Check your balance and service status via *111*52#
• 🔧 Reset network settings (Settings → System → Reset → Reset Mobile Network)
• 📡 Reconnect to the Wi-Fi network (forget the network and reconnect)
• 📱 Install the SIM card in a different slot (for dual-SIM devices)

Optimizing your Wi-Fi network for stable calls

VoWiFi quality directly depends on your wireless network settings. Even if the internet speed is high, incorrect router settings can cause delays and disconnects. Here are some key recommendations:

1. Selecting frequency and channel:

• 📶 Preferred frequency for VoWiFi 5 GHz - it is less loaded and provides a stable ping
• 🔄 In the router settings, select a fixed channel (for example, 36 or 149) instead of "Auto"
• 📊 Use apps like Wi-Fi Analyzer to find the least loaded channel

2. QoS (Quality of Service) settings:

• 🎯 Turn on QoS in the router control panel and set the maximum priority for UDP port 500 And 4500
• 📈 On routers ASUS And TP-Link activate Adaptive QoS → VoIP
• 🔧 For Keenetic create a rule: Traffic → Prioritization → Add Rule with port filter 500-4500

3. Security and Protocols:

• 🔒 Use encryption WPA3 (or WPA2-AES for older devices)
• 🚫 Turn it off WPS - it can cause conflicts with IMS traffic
• 🔄 Update your router firmware to the latest version (especially important for D-Link And Zyxel)

For owners of mesh systems (for example, Google Nest Wi-Fi or TP-Link Deco):

⚠️ Attention: In mesh networks, VoWiFi may be unstable due to switching between nodes. It is recommended to bind your smartphone to the main router via DHCP reservation or disable automatic reconnection to the nearest node.

Hidden features and life hacks for VoWiFi on MTS

In addition to the basic functionality, the VoWiFi service MTS has several hidden features that few people know about:

1. Battery saving:

• 🔋 On Android turn on the mode "Traffic Saving" For the Phone app, this will reduce background power consumption during VoWiFi calls.
• ⚡ On iPhone turn it off "Wi-Fi Assist" (Settings → Cellular → Wi-Fi Assist) to avoid switching to mobile Internet

2. International calls:

• 🌍 When connected to a foreign Wi-Fi network, VoWiFi allows you to call Russian numbers at your home rate (without roaming).
• 💰 Calls to local numbers are charged as international calls - check your plan's terms

3. Working with smartwatches:

• ⌚ On Samsung Galaxy Watch 4/5 And Apple Watch With eSIM VoWiFi works independently of the phone (if the watch is connected to Wi-Fi)
• 📱 To activate on Apple Watch required watchOS 8+ and VoWiFi enabled on paired iPhone

4. Alternative activation methods:

• 📋 On some plans, VoWiFi is turned on automatically upon activation VoLTECheck the status via *111*52#
• 🔄 If the option disappears after a firmware update, reset your network settings and reboot your device.

FAQ: Frequently asked questions about Wi-Fi calling on MTS

Is it possible to use VoWiFi without a mobile internet connection?

Yes, VoWiFi only requires a Wi-Fi connection. Mobile Internet (4G/5G) is not required, but must be activated VoLTE in your phone settings (even if you don't use mobile data).

Will VoWiFi work on the subway or on a plane?

In the metro - yes, if there is Wi-Fi coverage (for example, MTS (provides Wi-Fi in the Moscow metro). On planes, only if calls are allowed and in-flight Wi-Fi is turned on (usually for a fee). Keep in mind that in some countries (for example, the UAE), VoWiFi is prohibited on airplanes.

How to disable VoWiFi if it interferes?

On Android: Settings → Connections → Mobile Network → Wi-Fi Calling (turn off the switch). On iPhone: Settings → Cellular → MTS SIM card → Wi-Fi callingYou can also disable the option for a specific Wi-Fi network by holding its name in the list of connections.

Why don't I receive SMS messages when using VoWiFi?

This is a known issue on some devices. Solutions:

1. Turn off VoWiFi to receive SMS, then turn it back on
2. Use the app MTS Messenger for SMS via the Internet
3. Update your phone's firmware to the latest version

Can I use VoWiFi on a tablet with a SIM card?

Yes, if the tablet supports it VoLTE And VoWiFi. For example, Samsung Galaxy Tab S7+, Huawei MatePad Pro (models with 5G). The setup is similar to smartphones. iPad With eSIM VoWiFi only works on iPad Pro (2020 and newer) and iPad Air (4th generation and newer).